Digital Input Signal Inversions - Honeywell NX series User Manual

OPT-A2
Terminal
21 RO1/1
22 RO1/2
23 RO1/3
24 RO2/1
25 RO2/2
26 RO2/3
Table 6-10. Control I/O terminal signals on basic relay board OPT-A2
OPT-A3
Terminal
21 RO1/1
22 RO1/2
23 RO1/3
25 RO2/1
26 RO2/2
TI1+
28
29 TI1–
Table 6-11. Control I/O terminal signals on basic relay board OPT-A3
6.2.2.1

Digital input signal inversions

The active signal level depends on which potential the common inputs CMA and CMB (terminals 11 and
17) are connected to. The alternatives are either +24V or ground (0 V). See Figure 6-29.
The 24-volt control voltage and the ground for the digital inputs and the common inputs (CMA, CMB) can
be either internal or external.
+24V
Ground
nk6_16
Positive logic (+24V is the active signal) =
the input is active when the switch is closed
Figure 6-29. Positive/Negative logic
CABLING AND CONNECTIONS
Signal
Relay output 1
Relay output 2
Signal
Relay output 1
Relay output 2
Thermistor input
DIN1
DIN2
DIN3
CMA
Technical information
Switching capacity
Min.switching load
Switching capacity
Min.switching load
Technical information
Switching capacity
Min.switching load
Switching capacity
Min.switching load
Ground
+24V
Negative logic (0V is the active signal) =
the input is active when the switch is closed.
Requires setting of jumper X3 to position
'CMA/CMB isolated from ground'
69(110)
24VDC/8A
250VAC/8A
125VDC/0.4A
5V/10mA
24VDC/8A
250VAC/8A
125VDC/0.4A
5V/10mA
24VDC/8A
250VAC/8A
125VDC/0.4A
5V/10mA
24VDC/8A
250VAC/8A
125VDC/0.4A
5V/10mA
DIN1
DIN2
DIN3
CMA
6